PURPOSE: To greatly improve an operability by carrying out a sound quality adjustment at high and low temperature levels in accordance with an audio class by an audio class information signal and carrying out an audio reproduction.

CONSTITUTION: The audio class of audio data whose data is decoded is identified by an audio data identification section 120, inputted to an audio amplifying section 121 and outputted to a speaker 19. Then, the operation result of an adjusting button is notified to a CPU 10 through an adjusting button managing section 117. Level values, the results of these operations, are set on a high sound electronic volume and a low sound electronic volume by the CPU 10 and at the same time, the content of an area 40 storing high and low sound level values is renewed. On these electronic volumes, an optional value from 0 to 255 is set and in accordance with its value, strong and weak states of the high and low sounds are changed.